INFLUENCE OF SURFACE MODIFICATION ON THE ADSORPTION DYNAMICS OFO2ONCu{100}

P. Junell, M. Ahonen, M. Hirsimäki and M. Valden ()
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P. Junell: Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland
M. Ahonen: Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland
M. Hirsimäki: Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland
M. Valden: Surface Science Laboratory, Tampere University of Technology, PO Box 692, FIN-33101, Tampere, Finland

Surface Review and Letters (SRL), 2004, vol. 11, issue 04n05, 457-461

Abstract: Translational energy(ET)dependence of oxygen(O2)adsorption on clean and modifiedCu{100}has been studied by molecular beam surface scattering (MBSS) experiments. The role of surface defects on the adsorption dynamics has been investigated by blocking the defects with Ag and oxygen atoms, and by increasing the defect density withAr+-ion bombardment. At lowETthe adsorption ofO2is shown to be indirect and facilitated either by a dynamical steering mechanism or a precursor state. At highETthe defects have only marginal effect on the adsorption. Additionally, the modification of the surface electronic structure by preadsorbed oxygen is shown to have a pronounced effect on the adsorption dynamics, whereas the electronic structure modification by preadsorbedAgis shown to be relatively inefficient in changing the reactivity ofCu{100}towardsO2adsorption.

Keywords: Oxygen; copper; dissociative chemisorption; surface chemical reaction; molecular beam; surface scattering (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X0400627X

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